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@ 2013-12-02T09:05:16Z

<?php

$value = '2010-05-29 15:54';

$pattern = '(\d{4}-\d{2}-\d{2} \d{2}(:\d{2})?(:\d{2})?)';

var_dump(preg_match($pattern, $value));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match: documentation ( source)

preferences:dark modelive preview

47.09 ms | 402 KiB | 5 Q